At Kishuu Private High School, a turbulent environment of gang conflicts and Yakuza influences unfolds as sophomore Nagato joins the all-boys school, disrupting the established power dynamics. Unfamiliar with the school's unwritten rules, Nagato attracts the attention of a senior leader. After a humiliating defeat by the senior's follower, Ai, Nagato swears revenge, unaware of the hidden secrets lurking beneath Ai's calm facade.